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Table 3 Difference between typical and atypical FAD by ultrasound

From: Ultrasound Lexicon in diagnosis and management of breast fibroadenoma: when to follow up and when to biopsy

Sonographic features Typical FAD Atypical FAD
Grey scale imaging N = 36 N = 35
A. Shape
 Oval 33 (91.7%) 32 (91.4%)
 Round to irregular 3 (8.3%) 3 (8.6%)
B. Border
 Well circumscribed/(lobulated < 3) 36 (100%) 24 (68.6%)
 Lobulated (> 3) 0 2 (5.7%)
 Angular 0 5 (14.3%)
 Irregular 0 3 (8.6%)
 Microlobulations 0 1 (2.8%)
C. Echogenecity
 Iso 26 (72.2%) 14 (40%)
 Mixed 9 (25%) 16 (45.7%)
 Hypo 1 (2.8%) 3 (8.6%)
 Hyper 0 2 (5.7%)
D. Orientation
 Wider than taller 36 (100%) 31 (88.6%)
 Deeper more than wider 0 4 (11.4%)
E. Posterior acoustic features
 None 26 (72.2%) 16 (45.7%)
 Enhancement 8 (22.2%) 14 (40%)
 Shadowing 2 (5.6%) 5 (14.3%)
F. Arrangement of vessels
 Central 0 7 (20%)
 Peripheral 7 (19.4%) 9 (25.7%)
 Both 0 10 (28.6%)
 No 29 (80.6%) 9 (25.7%)
G. Vascularity
 Few 7 (19.4%) 23 (65.7%)
 Much   3 (8.6%)
 No 29 (80.6%) 9 (25.7%)
H. Associated findings
 Yes 1 (2.8%) 6 (17.1%)
 No 35 (97.2%) 29 (82.9%)